Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Bullet seater die
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Mikecr" data-source="post: 1149606" data-attributes="member: 1521"><p>Variance in cartridge base to ogive (CBTO) is usually due to variance in/excess seating forces.</p><p></p><p>Placing a seating stem datum higher on the ogive would only make matters worse.</p><p>Variance in CBTO from force is due to wedging of the stem against the ogive. So the reason stems take datum closer to tip than bearing is because this presents a higher angle to press against, reducing wedging.</p><p>Way up on the ogive near land contact datum presents such a low angle (esp. w/tangent ogives) that wedging is a certainty. This is why die makers do not do this.</p><p></p><p>You could make a hollow stem and then bed it to a specific bullet, creating far more contact area, provided the ogives present the same radius. Problem is -they don't.</p><p>Ogive radius varies at XX% per box.</p><p>Your ogives could first be qualified with a Bob Green Comparator (BGC),, OR,, you can do something about your seating force variances and the whole problem of inconsistent CBTO goes away.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1149606, member: 1521"] Variance in cartridge base to ogive (CBTO) is usually due to variance in/excess seating forces. Placing a seating stem datum higher on the ogive would only make matters worse. Variance in CBTO from force is due to wedging of the stem against the ogive. So the reason stems take datum closer to tip than bearing is because this presents a higher angle to press against, reducing wedging. Way up on the ogive near land contact datum presents such a low angle (esp. w/tangent ogives) that wedging is a certainty. This is why die makers do not do this. You could make a hollow stem and then bed it to a specific bullet, creating far more contact area, provided the ogives present the same radius. Problem is -they don't. Ogive radius varies at XX% per box. Your ogives could first be qualified with a Bob Green Comparator (BGC),, OR,, you can do something about your seating force variances and the whole problem of inconsistent CBTO goes away. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Bullet seater die
Top